Lumber-drying kiln



( Model '2 sheets-sheet 1. W. GRAHAM.

LUMBER DRYING KILN.

No. 538,412. Patented Apr. 30, 1895.

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WILLIE GRAHAM, OF MERIDIAN, MISSISSIPPI.

LUMBER-DRYING KILN.

SPECIFICATION forming part of Letters Patent No. 538,412, dated April30, 1895.

(No model.)

To all whom it may concern:

Be it known that I, WILLIE GRAHAM, of Meridian, in the county ofLauderdale and State of Mississippi, have invented certain air from thechamber below ascends.

new and useful Improvements in Lumber- Drying Kilns; and I do herebydeclare the following to be a full, clear, and exact description of theinvention,such as will enable others skilled in the art to which itappertains to make and use the same. 7

My invention relates to an improvement in lumber drying kilns and itconsistsin certain novel features of construction and combinations ofparts which will be hereinafter described and pointed out in the claims.

In the accompanying drawings, Figure 1 is vertical sectional viewthrough the building. Fig. 2 is a longitudinal sectional view throughthe furnace, radiator, and expansion-joint. Fig. 3 is aview in frontelevation. Fig. 4 is a transverse sectional view on line w x of Fig. 3.Fig. 5 is atransverse section on line 2 y of Fig. 2, and Fig. 6 is afront perspective of the radiator.

A represents the kiln or building. This is arranged so as to have thedrying chamber occupy as much space as possible; To this end thebuilding is preferablydivided into two chambers, the dividingcross-beams 1, 1, constituting an open work fioor on which the lumber ispiled and through which the heated The drying chamber'preferably hasdouble walls, the spaces 2 between forming condensing chambers for thereturn currents of air. The top of the chamber has a central outlet atfor the escape of the air. The ceiling is also double leaving an airspace 5 which comm unicates with the outlet land the spaces 2 for thereturn of the air as it becomes cooler, to the chamber at the bottom ofthe building where it is again heated and returned. For this purposethere is an air space 6 in the bottom of the building. The bottom ispreferably covered with sand or similar material.

In the lower compartment the furnace and radiator are located and aspace 7 is left on either side thereof through which the heated airpasses.

B is the furnace. This is preferably lined with fire-brick andotherwise'it does not differ materially from other furnaces except thata cold air duct 8 is formed about it whereby this air is heated directlyfrom the furnace on its way into the building, and the top of thefurnace is the better protected.

0 is the radiator. shaped in'cross section with a flat top 10, theadvantage of this form being that it prevents warping and that there aremore square inches of heating surface to the'running foot without havingto make the first story of the kiln so high as if the radiator wereround. The only part of this radiator liable to burn out is the top andthis is easily repaired.

Connecting the furnace and radiator is the expansion joint adapted tocompensate forthe expansion and contraction due to heat and cold. Thisconsists in a large pipe 12 extending from the furnace to the radiator.This pipe is lined with fire brick as shown, the bricks extending beyondthe ends of the pipe thus protectingthe latter against being burned outand permitting expansion and contractiondue to heat and cold. Collars13, 13, extend outwardly toward each other from the furnace and radiatorand rods 14, 14, extend from the lugs 15, 15 on these collars to 'holdthe furnace and radiator together. In-

side are flues 16, 16, which prevent the-flames from entering theradiator. These are piled inside the expansion joint like checker workand being entirely independent thereof may be readily removed andreplaced in case they become burned out. The air passing up around thisexpansion joint and radiator is heated thoroughly and thus prepared tocure the lumber which is located above it.

Although I have only described one furnace radiator and expansion jointit is obvious that several might be used as the exigency of the occasionmay require.

It is evident that other slight changes might be resorted to in the formand arrangement of the several parts described without departing fromthe spirit and scope of my invention and hence I do not wish tolimitmyself to the exact construction herein set forth, but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. The combination with a furnace, and radiator,of an expansion jointbetween the two, said joint consisting of a pipe having a fire This ispreferably U- brick lining and removable flues therein, sub- -Intestimony whereof I have signed this stantially as set forth.

specification in the presence of two subscrib- 2. The combination with afurnace, and radiator, of an expansion joint between and connecting thetwo, said joint consisting of a pipe two collars, and rods connectingthese collars together, substantially as set forth.

ing Witnesses.

WILLIE GRAHAM. Witnesses:

W. E. BROACH, HENRY F. BROACH, Jr.

